抄録
The post-wall waveguide is inherently a laterally open structure so long as the number of post array layers is finite. A part of the electromagnetic energy may leak out through the gaps between periodic posts, thus resulting in a leakage loss. If the gap length is sufficiently smaller than the half of wavelength and the post-walls are stacked with enough number, the leakage effect may be treated as a small perturbation. In this paper, we shall discuss the perturbation analysis of the leakage loss of the post-wall waveguide by using a model of two-dimensional photonic crystal waveguides.
